Circuit breaker reclosing relay



De@ 8, l931- c. E. SCHNELL ET AL 1,835,342

CIRCUIT BREAKER RECLOSING-RELY I Filed Oct. 24, 1925 4 Sheets-Sheet lCHARLA: .Escl-meu. fmvesr A. 3A DLER ATTOR EY Dec. 8, 1931. c. E.SCHNELL ET AL CIRCUIT BREAKER RECLOSING RELAY Filed Oct. 24, '1923 4Sheets-Sheet `2 W INVENTORS L/-Mfnsa Esc/#NELL ERA/57" fr. .SAU LER my'ATT RNE Dec. 8, 1931. c. E. SCHNELL ET AL 1,835,342

CIRCUIT BREAKER RECLSING RELAY Filed Oct: 24, 1923 4 Sheets-Sheet 5 mil/Y /l za f INVENTORS CHA Les SCHNELL RNA-cr KSA oLER Dec. 8, 1931. c. E.SCHNELL ET AL 1,835,342v

CIRCUIT BREAKER RECLOSING RELAY Filed Oct. 24, 192:5 4 Sheets-Sheet 4flfg x /49 /47 (H l2 I4?, v /50 '5 125 424 /29 y fl@ l5 l /62/ 27 Ls/101 59 l 6 lazo ou: 34 f lez 5, 24 fles' i131 [9 y \l "nl, ze me a 166ma 166 y l5f" 53T?- j [72* IN VEN TOR. m z. MQ

A TTORNEY.

Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE CHARLES E. SCHNELL ANDERNEST X. SADLER, OF FRESNO, CALIFORNIA CIRCUIT BREAKER RECLOSING RELAYApplication led October 24, 1923. Serial No. 670,467.

Our invention relates primarily to a relay for use in the controlcircuit of an oil circuilt breaker or switch and it has for its objectthe A provision of means set in motion by the open- 5. ing of thecircuit breaker or switch by reason of an overload, or other adverseconditions, for testing the circuit by automatically reclosing thecircuit breaker or switch a predetermined number of times. In the eventthe adverse conditions causing the trouble have been removed the circuitbreaker or switch will remain closed, andthe relay will automaticallyreset itself to its starting position'.

Gtherwise the same will be locked out. After the trouble on the line fedfrom the switch has been remedied the relay may be unlocked permittingthe switch to be closed.

It is one of the objects of our invention to provide a device of theabove character which may be easily and quickly installed orincorporated in a circuit already in operation without materiallyaltering or interfering with the same.

A further object is to provide a device of the above character whichwill be simple and efficient in operation, automatic in action, andwhich when once installed will require but the minimum of attention.

Other objects and advantages will appear hereinafter, and while we haveshown and will describe the preferred form of our invention, we wish itto be specifically understood that we do not limit ourselves to suchpreferred form, but that various changes and adaptations may be madetherein without departing from the spirit of our invention.

In the drawings accompanying and forming a part hereof:

Fig. 1 is a front elevation of our device as positioned for use, withthe cover removed.

Fig. 2 is a section on the line 22 of Fig. 1, showingr the cover.

Fig. 3 is a side elevation of a portion of our device removed from itscase. 45 Fig. 4 is a section taken on the line 4--4 of Fig. 2, withparts omitted for clearness of illustration.

Fig. 5 is a wiring diagram of our device connected to one type ofcircuit breaker reclosing system.

The heavy lines showin our device and its connections to oneform o anexisting remote control circuit for an oil or air circuit breaker.

Referring to the drawings, our device comprises an outer pan-shaped baseor casing 10 provided in the bottom thereof with terminal studsindicated generally by the numeral 11 by means of which the same issecured to a switchboard or other place of use. The outer or open end ofcasing 10 is closed by a detachable closure 11a, preferably of glass,which is provided with a recess 12 in its open end, of a size andconfiguration to receive the open end of casing 10, and is heldpositioned by studs 13 one end of each of which is rigidly mounted inthe bottom wall of casing l0. The other end of each of the studs 13 pro--jects through apertures near each side of closure lla and is providedwith a Wing nut 14 and a Washer 15. Suitable shock absorbing orinsulating material 16 is mounted within recess 12, the purpose of whichwill be ob.- vious.

Rigidly mounted upon the inner face of the bottom wall of base 10, bymeans of screws 17, is a bracket 18 in which is mounted, centrallythereof, a vertically extending solenoid 19 provided with a plunger 20.Solenoid 19 is iron bound and is provided on its lower end with adownwardly extending sleeve 21 in the sides of which is a verticallyextending groove or slot 22 for the reception of a pin 28 on the lowerend of the plunger 2() and serves to prevent rotation of the plunger 20relative to solenoid 19. v Plunger 20 is provided with a centrallongitudinal borefthe lower end of which is threaded, and in this boreis mounted a rod 24 the lower end of which is threaded for operativeengagement with the threaded end of plunger 20, a lock nut 25 on thelower end of rod 24 serving to lock the same in its adjusted position.|This construction is provided to permit adjustment of the length oftravel of pluger 20, as will be hereafter more fully explained.

The upper end of rod 24 is secured to the lower end of a plunger 26 of aretarding means in the form of a dash pot 27. Dash pot 27 is pivotallyconnected at its upper end tol an arm 28 extending forwardly fron theupper end of bracket 18. Extending upwardly from the top of solenoid 19,at opposides thereof, are blocks 29 and 30 of insulating material, towhich are secured the lower ends of fixed contact members 31 and 32,which contact members extend upwardly and have provided on their freeends contact oints 33 and 34. Extending upwardly rom the top of blocks29 and 30 are brackets 35 and 36 which are preferably bifurcated and inthese bifurcated ends are rockably mounted movable contact carryingmembers 37 and 38 in the upper faces of which are mounted movablecontact points 39 and 40 insulated therefrom. The free ends of members37 and 38 extend towards each other and pass on opposite sides ofplunger rod 24, resting against a spring 40a positioned above the upperend of the solenoid 19. Rod 24 is provided with a horizontally extendingpin -41 which is of a length sufficient to pass over the free ends ofmembers 37 and 38 and move the same downwardly, as hereafter explained.

Mounted upon the rear wall of casing 10, at the side of bracket 18, is abracket 42 pro- 'vided at its lower end with a forwardly extending arm43 which arm is in turn providedwith two spaced upstanding arms 44 and45 the upper ends of which terminate in bearings 46 and 47. Revolvablymounted in bearings 46 and 47 is a shaft 48 carrying a .switch member inthe form of a disc 49 of lnsulating material, this disc being providedaround its outer edge with a plurality of equally spaced holes 50, inwhich holes are ada ted to be removably mounted circuit closlng studs51. The studs 51 have their ends threaded for the reception of nuts 52and 53 by means of which said `studs are held positioned in holes 50.The projecting ends of studs 51 are provi/ded with rounded contactpoints. Provided in the periphery of disc 49, in lieu of one of theholes 50, is a locking notch 54 by means of which said disc is lackedagainst rotation, as hereinafter explained. Shaft 48 projects inwardly ashort distance be ond bearing 46 and rigidly gounted upont is projectingend is a gear Pro'ecting outwardly from bracket 42, near t e upper endthereof, is a lug 56 upon the free end of which is pivotally mounted oneend of a control plate 57. Plate 57 extends downwardly and is providedat its lower end with a right angled lip 58. Extending outwardly frombracket 42, at opposite sides of lip 58, are abutments 59 and 60 'inwhich are operatively mounted adjusting screws 61 and 62, whichscrews,.with lip 58, control the amount of oscillation of plate 57Connected at one end to the outer'edge of plate 57, a short distanceabove lip 58, isa coil sprlng 63 the other end of which is mounted upona stud or pin 64 mounted in bracket 42 and serves to hold lip 58 incontact with screw 62, thereby holding plate 57 in its inoperativeposition.

Mounted upon the upper end of plate 57, by means of brackets 65 and 66is a motor 67 on a shaft 68 of which is rigidly mounted a worm 69.lSecured to the under side of motor 67 is a bracket 70 provided at eachside thereof with downwardlv depending bearings 71 and 72, and in thesebearings are revolvably mounted the ends of a shaft 73. Rigidly mountedupon shaft 73, near bearing 71, and in operative engagement with worm 69of shaft 68is a worm wheel 74. Rigidly -mounted upon shaft 7 3, nearbearing 72, is a worm 75. Worm 75 meshes with a worm wheel 76 rigidlymounted dupon a shaft 77 near one end thereof. Shaft 77 is revolvablymounted in bearings 78 and 79 depending downwardly from bracket 70, atright angles to bearings 7l and 72, and has rigidly mounted upon one endthereof a gear 80 which is adapted when plate 57 is oscillated intooperative position to mesh with gear wheel 55 to rotate disc 49, thusforming a magnetically actuated clutch mechanism connecting the motor 67and the disc 49. Extending outwardly from plate 57, near the lower endthereof, is an arm 81 which acts as a clapper for a' magnet 82. Magnet82 is iron bound and is mounted at one end upon a bracket extendingoutwardly from bracket 42. Disc 49 is preferably secured to shaft 48 bymeans of flanges 83 and 84 riveted thereto, and a hub 85, which hub issecured to said flanges in any suitable manner. Hub 85 is provided witha set screw 86 by means of which the position of said hub and itscomplement parts is secured upon shaft 48. The outermost flange 83 isprovided near its outer edge with a plurality of internally threadedholes 87 any one of which is adapted to receive a stop pin 88 which isadapted to engage a similar pin 89 which is adapted to extend inwardlyfrom the inner face of arm 45. Coiled around shaft 48, between ilange 83andthe inner face of bearing 47, is a spiral spring 90 the inner end ofwhich is attached to shaft 48 and the other end of which is mounted upona pin 92 extending inwardly from an adjusting disc Disc 93 is providedwith an integral sleeve which projects through bearing 47 loosely andhas its free end threaded for the reception of a lock nut 95 so that bytightening thislock nut the spring 90 may be held wound to any desireddegree. and supports the outer end of shaft 48.

Extending outwardly from the upper end of bracket 42 is an arm 96 thefree end of which is `'bifurcated. Mounted upon the upper face'of arm96, to extend across said bifurcated end, is a plate 97 of libre orother vsuitable insulating material.4 Extending upwardly from the top ofplate 97, at oppo- Sleeve 94 is hollow site ends thereof are brackets 98and 99 which are preferably bifurcated and in these bifurcated ends arerockably mounted movable contact carrying members 100 and 101 in thefree ends of which are provided slots 102 for the reception of a pin103. Pin 103 `is mounted near the upper end of a vertical lockout shaft104. Depending downwardly from the under side of arm 96 is asubstantially U-shaped bracket 105, the lower cross barof which servesas a guide for the lower end of shaft 104. The' lower end of shaft 104is bifurcated and `carries a roller 107 adapted to normally roll on theperiphery of disc 49 and to drop into notch 54 to lock disc 49 againstreturn to normal when this roller reaches this notch.

The upper end of shaft 104 is pivotally connected to one end ofa lever108 which lever is pivotally mounted intermediate its ends in the upperend of a standard 109 extending upwardly from arm 96. The other end oflever 108 is bifurcated to straddle a resetting shaft 110 the upper endof which projects through the top wall of casing v10 and terminates ina. button or head 111. Coiled around shaft 110, between button 111 andcasing 10, is a coil spring 112 which serves to hold shaft 110 in itsuppermost position. Provided in shaft 110, just above the end of llever108, is a pin 113 for a purpose to be hereafter explained. Pins 114 and115 in shaft 110 provide means .for limiting the nlp :find down movementrespectively of said s a t.

Provided in the lower end of shaft 110 is a pin 116 the ends of whichproject between the furcations of one ends of a bell crank 117. Crank117 is pivotally mounted upon the free end of a pro'ection 118 extendingforwardly from brac et 18 and has the free end of its other longer armpivotally connected to one end of a link 119. The other end of link 119is piyotally connected to the short end of a bell crank 120, pivotallymounted on the end of projection 118. The other longer end of crank120is forked and straddles plunger 26 when in its operative position andengages a pin 121 in plunger 26 to prevent upward movement of plunger 26Mounted upon the upper faces of contact carrying members 100 and 101,insulated' therefrom, are upwardly extending contacts 122 and 123provlded with contact points 124 and 125. Extending .upwardly from plate97, at each-end thereof, are contacts 126 and 127 provided on their freeends with contact points 128 and 129 adapted to engage contact points124 and 125. Depending downwardly from plate 97, on opposite sides ofdisc 49, are spring contacts 130 and 131 provided with-contact points132 and 133 adapted for engagement by studs 51, the

v contact points 132 and 133 cooperating with the studs on the switchmember to form a reclosin A switchfor a circuit breaker connected tereto in a manner to be hereinafter described. Extending downwardly fromplate 97 at each end thereof, are arms 134 and 135 the lower ends ofwhich are threaded, and in these threaded ends are adjustably mountedadjusting screws 136 and 137 by means of which the pressure of contactpOnts 132 and 133 against studs 51 is regulated. Lock nuts 138 and 139are provided to lock screws 136 and 137 in their adjusted o positions.

For the purpose of clearness in the following description of theoperation of our device, we shall refer to the contact points 33 and 40as comprising a. clutch-control switch, this terminology appearing alsoin the appended claims. Similarly, the lcontact points 34 and 39 aredesignated as a motorcontrol switch, while the contact points 124 and128 are designated an alarm switch. So also, contact points 125 and 129comprise alockout switch and the solenoid 82 has been termed a clutchsolenoid to differentiate this solenoid from the solenoid 19 which hasbeen termed an energizing solenoid. So also, the studs 51 have beentermed primary contacts, while the contact points 132 and 133 have beentermed secondary contacts for the purpose of clearness and deliniteness.

The terminal studs 11 serve a dual purpose of holding the relay of ourinvention to a switch board and of forming terminals 149 to 156inclusive which connect the internal and external wiring of the relay.

Referring particularly to Fig. 5 we illustrate a Wirin diagram of ourdevice in conjunction with one type of circuit breaker reclosing systemto which our relay may be connected. This choice of system is merely anarbitrary one, and it should be understood that We are not limited tothe use of this t of reclosing system, this system being s own in lightlines in Fig. 5.

Fig. 5 illustrates our invention as connected to a circuit breaker Ahaving a closing mechanism M which is operated when the solenoid ofanauxiliary relay S is energized. The energization of this auxiliarysolenoid shunts a pairpof contacts c and d, thus completing a circuitthrough the mechanism M and through leads E and P which are connectedrespectively to conductors C and D of a control bus. We prefer toenergize this bus with direct current, but this choice is not essentialto the utility of our invention.

One terminal of the auxiliary solenoid S is connected to lead E and to aconductor H which is in turn connected to the terminal stud 155 bya'conductor 141. This terminal stud is also connected to the contactpoint 132 of the secondary contacts of the recloslng switch by aconductor 173. The contact polnt 133 of this switch is connected to themovable contact 40 of the clutch control switch by a conductor 161, thismovable contact being also connected to one terminal of the winding ofthe clutch solenoid 82 by a conductor 165. A conductor 166 connects theother terminal of the winding of the solenoid 82 to the terminalstud 152which is in turn connected by conductors 172 and 140 to the busconductor D through a switch 138. The switch 138 is of double-poleconstruction and is also included between conductors 139 and 170which-join the control bus conductor C to the terminal stud 151, thisstud being connected to one terminal of the Winding of the energizingsolenoid 19 by a conductor 163 and to the stationary contact point 33 ofthe clutch-control switch by a conductor 162. A conductor 160 connectsthe other terminal of the winding of the solenoid 19 to the stationarycontact point 129 of the lockout switch. The contact point 125 of thelockout switch is connected by a conductor 157 to the terminal stud 156which is in turn connected to a conductor 142 leading to a terminal a ofa pallet switch B. This pallet switch has another contact b which isconnected to the contact d. TheV movable element of the pallet switch Bis mechanically connected to the circuit breaker A so that this movableelement shunts across the terminals a and b when the circuit breakeropens.

An alarm circuit is formed by conductors 145 and 146 which arerespectively connected to terminal studs 150 and 149 by conductors 147and 148, these terminal studs being in turn respectively connected tomovable and stationary contact points 124 and 128 of the alarm switch byconductors 159 and 158. Thus, the alarm circuit .is closed when thecontact points of the alarm switch come into engagement.

The motor 67 is adapted to receive energy from. a motor bus composed ofconductors 144 and 143, respectively connected through terminal studs153 and 154, and through conductors 16S-and 167, to the movable contactpoint 39 of the motor-control switch and to one terminal of the motor67. The other terminal of themotor is connected to the stationarycontact point 34 of the motor-control' switch byV a conductor 169 sothat when the contact points of the motor-control switch are inengagement, the motor 67 will be put intooperation.

Upon the occurrence of an adverse' condition on the circuit the circuitbreaker A opens,'du'e to the action of a tripping coil N, or otherdevice, and the contacts a and b of the pallet switch are closed, thuscompleting a circuit through Vconductors E, G, 142 i.

way of the conductor 160, this current re-v The closing of themotor-control switch' completes a circuit from the motor bus through theconductors 168, 169, and 167, thus energizing the motor 67.Simultaneously, the closing of the clutch-control switch completes acircuit through conductors 139, 170, 162 and 165, the current thenpassing through the winding of the clutch solenoid 82 and returningthrough conductors 166, 172 and 140 to the control bus.

This energization of the clutch solenoid 82 moves the control plate 57until the lip 58 engages the adjusting screw 61, this movement takingplace against the `action of the spring 63. The adjusting screw 61 is soadjusted that the gear 80 at this time comes into 'operative engagementvwith the gear wheel 55. The clutch means formed by the gear 80 and gearwheel 55 will remain in position to operatively connect the motor 67 andthe discl 49 as long as current is flowing through the solenoid 82, thiscurrent being only interrupted when the clutch-control switch is opened.

Vhen the disc 49 is rotated a distance suficient to bring the irst stud51 into engagement with the contact points 132 and 133, current passesthrough conductors 139, 17 0' and 162, this current reaching the contactpoint 133 through conductor 161 and the motor-control switch. The stud51-carries the current to thecontact point 132 whence it returns -to thecontrol bus through conductors 173, 141 and H, passing throughtheauxiliary solenoid S on its way. This energizes the solenoid S and4causes the contacts c and d to be bridged, thus sending current throughthe reclosing mechanism M .and reclosing the contacts of the circuitbreaker A.

If thel adverse condition has been removed from the circuit in which thecircuit breaker A is connected, the relay of our invent-ion will shutdown after a predetermined time interval, due to the pallet switch Bopening the circuit between the contacts a and 'Vhen this circuit isopened, no current will How through the energizing solenoid 19, and theplunger 20 thereof will tend to drop downward into a retracted position.`This downward movement is retarded by the dash pot 27 so that theclutch-control switch and motor-control switch are not openedimmediately but are held in closed position by the spring 140 until thepin 41 lowers into en-- gagement with the contact-carrying members 37and 38. This simultaneously opens the clutch-control switch' andmotor-control switch and thus de-energizes the clutch so/lenoid 82 andthe motor 67. The spring 63 thus draws the control plate 57 into such a.position that the clutch means is disengaged. This releases the gearwheel 55 and allows the spiral spring 90 `to return the disc 49 to itsformer position at which time the stop pin 88 engages the stop pin 89.

Should the adverse condition remain on the circuit after the breaker hasbeen once reclosed, the tripping coil N, or an equivalent means, willimmediately open the circuit breaker A, thus again completingr a circuitthrough the solenoid 19 which again moves the plunger 20 into advancedposition. The dash pot 27 is so regulated that the plunger 20 does notopen the motor and clutch-control switches until after the breaker A hashad time to again open if the adverse condition remains on the circuit.The clutch solenoid 82 and motor 67 are thus not de-energized, butcontinuously cooperate to turn the disc 49 until the second stud 51bridges the contact points 132 and 133. At this instant, the reclosingmechanism M is again energized and again recloses the circuit breaker A.

In the event that the adverse condition on the circuit is a permanentone, it is desirable to lock the relay in inoperative position relativeto the circuit breaker A after the occurrence of a predetermined numberof reclosings, depending upon the number of studs 51 placed iii the disc40. This is accomplished when the disc 49 is rotated to such an extentthat the roller 107 drops into the notch 54, thus separating the contactpoints 125 and 129 of the lockout switch and moving into engagement thecontact points 124 and 128 of the alarm switch. This opening of thelockout switch de-energizes the solenoid 19, While the closing of thealarm switch-completes a circuit through the conductors 145 and 146 andthrough the visible or audible signal connectedv thereto. Thede-energization of the solenoid 19 of course de-energizes the motor 67and clutch solenoid 82. i

Before the relay can again be placed in operative relation relative tothe circuit breaker A after a lockout has taken place.l the operatormust depress the button 111` This raises the roller 107, opens the alarmswitch. and closes the lockout switch. Simul taneouslv, the movement ofthe button 111 causes the bifurcated end of the bell crank 120 to engagethe pin 121, thus preventing any upward movement of the plunger 20. Thisis necessary when it is understood that the spiral spring 90 ret-urnsthe disc 49 to its original position as soon as the roller 106 is liftedfrom the notch 54. As the vterminal studs successively pass the contactpoints 132 and 133, a circuit is successively completed through thereclosing switch. The solenoid 19 is also at this time energized if thecircuit breaker A has remained open, thus tending to force the plunger20 into advanced position. The bifurcated end of the bell crank 120prevents this movement of the plunger and thus prevents a closing of theclutchcontrol switch and motor-control switch, thus preventing thereclosing of the circuit breaker A during the reverse movement of thedisc 49.

The time interval -between successive energizations of the auxiliarysolenoid S, and thus between successive reclosings of the circuitbreaker A, is adjustable by varying the spacing of the studs 51 in theholes 50. Thus, by separating these studs a greater distance, the timeinterval between reclosings is increased. Similarly, the desired numberof reclosings before lockout may be regulated by the numberof studs 51.The time interval between the first opening of the breaker A and lockoutmay be regulated by changing tlie position ofthe pin 88 in the holes 87,thus regulating the position to which the disc 49 may be returned underthe action of the spiral spring 90 and consequently the distance thisdisc must travel before the roller 107 drops into notch 54.

It should be clear that our invention is applicable not only to theparticular circuit shown, but is applicable also to any system requiringone or more energizations of an operating circuit due to one or moreenergizations of a control circuit. The control circuit in the presentillustration includes the solenoid 19 and the pallet switch B, with thelockout switch as an auxiliary accessory. Similarly, the operatingcircuit includes the reclosing switch with its studs 51 and contactpoints 132 and 133 or an equivalentl switch.

In certain of the appended claims we have termed the motor 67 a constantspeed motor, but this term should not be interpreted to include onlysuch types of motors as maintain unvarying speeds with different loads,such as a synchronous motor. The term is used in these claims todifferentiate our invention from certain other devicesemployintermittent movement of a switch member. Thus, our motor is onewhich imparts to the disc 49 a continuous movement during the time ofoperation thereof rather than an intermittent movement.

It will be seen that the circuit breaker is of the conventional type,being provided with a closing means M which is adapted when energized toclose the breaker, and a conventional tripping means, including therelay S. The circuit breaker also includes the pallet switch B, all ofthese instrumentalities being found in the conventional type ofelectrically operated circuit breaker. The energizing solenoid and itsassociated wiring may be conveniently termed energizing means Storpurposes of identification. The rotating disk 49 with its associatedparts is of course ing magnetically operated pawls to effect the asequence controlling means, the sequence of operations of the devicebeing controlled by the positions of the membersv 51. Otherinstrumentalities well known in theart for performing the same functionsc'an of course be substituted for all of the above instrumentalities.

Having described our invention, what we claim is:

1. A reclosing mechanism for use with aA circuit breaker having maincontacts, -a tripping coil, a closing coil, and a pallet switch,comprising: a sequence controlling means; an energizing means includinga coil so connected as to be energized While said pallet switch isclosed due to said circuit breaker being open, and when so energized tothrow said energizing means into its active position; means by whichsaid energizing means causes said sequence controlling means to move ata definite rate from a primary position toward a secondary position at adefinite rate during the time said energizing means is in its activeposition; means by Vwhich said sequence controlling means may repeatedlyclose said circuit breaker by energizing its closing coil at definitepositions of said sequence controlling means between said prlmary andsecondary positions; adash-pot so embodied in said energizing means asto hold sald energizing means in its active position (with the coil ofsaid energizing means deenergized) for a suliicient period to allow saidcircuit breaker to bel closed and immediately open under overload; and alocking member for mechanically locking said sequence controlling meansin its extreme secondary position Whenever it reaches that position.

2. A reclosing mechanism fora-use with a circuit breaker having maincontacts, a tripping coil, a closing coil, and a pallet switch,comprislng: a sequence controlling means; an energlzing means includinga coil so connected as to be energized while said pallet switch 1sclosed due tosaid circuit breaker being open, and when so energized tothrow said energizing means into its active positlon; means by whichsaid energizing means causes said sequence controlling means to move ata definite rate from a primary positron toward a secondary position at adefinite rate during the tlme said energizing means is in its activeposition; means by whlch vsaid sequence controlling means may repeatedlyclose said circuit breaker by energizmg its closing coil at definitepositions of saidsequence controlling means between said primary andsecondary positions; a dash-pot so embodied in said energizing means asto hold said energizing means in its active position (with the coil ofsaid energizing means deenergized) for a sufficient period to allo-wsaid circuit breaker to be closed and immediately open under; overload;a locking memday of August, 1923.

Les-5,342

ber for mechanically locln'ng said sequence 3. A recloslng mechanism foruse with a circuit breaker having main contacts, a tripping coil, aclosing coil, and a pall'et switch,

comprising: a sequence controlling means; an energizing means includinga coil so connected as to be energized while saidv pallet switch isclosed due to said circuit breaker being open, and when so energized tothrow said'energizing means into its active position; means by whichsaid energizing means causes said sequence controlling means to move ata definite rate from a primary position toward a secondary position at adefinite rate "during the time said energizing means is in its activeposition; means by which said sequence controlling means may repeatedlyclose said circuit breaker by energizing its closing coil at definitepositions of said sequence controlling means between said primary andsecondary positions; a dash-pot so embodied in said-energizing means ashold said energizing means in its active posi.

tion (with the coil of said energizing means have hereunto subscribedour names this 16th CHARLES E. SCHNELL. ERNEST K. sAnLEE.

